2251285649 has 2 divisors, whose sum is σ = 2251285650. Its totient is φ = 2251285648.

The previous prime is 2251285583. The next prime is 2251285667. The reversal of 2251285649 is 9465821522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2249130625 + 2155024 = 47425^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251285649 - 2¹⁶ = 2251220113 is a prime.

It is not a weakly prime, because it can be changed into another prime (2251285249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1125642824 + 1125642825.

It is an arithmetic number, because the mean of its divisors is an integer number (1125642825).

Almost surely, 2^2251285649 is an apocalyptic number.

It is an amenable number.

2251285649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2251285649 is an equidigital number, since it uses as much as digits as its factorization.

2251285649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 44.

The square root of 2251285649 is about 47447.7148975586. The cubic root of 2251285649 is about 1310.6202313272.

The spelling of 2251285649 in words is "two billion, two hundred fifty-one million, two hundred eighty-five thousand, six hundred forty-nine".